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Summary of Significant Accounting Policies - Revenue Recognition (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Revenue Recognition [Line Items] |  |  |  |  |  |
Revenue recognized related to amounts in contract liabilities outstanding at the beginning of period | $ 79,000 |  | $ 343,000 |  |  |
Revenue, remaining performance obligation | $ 5,580,000 |  | $ 5,580,000 |  |  |
Revenue, remaining performance obligation expected to be recognized within twelve months | 79.80% |  | 79.80% |  |  |
Change orders and/or claims | $ 110,600 |  | $ 110,600 |  |  | $ 144,000
Revenue, related to performance obligation satisfied in previous periods | 15,800 |  | 47,400 |  |  |
Change in contract estimates, impact on operating results, gain (loss) | $ 800 | $ 28,800 | $ 14,200 | $ 31,000 |  |
Percent aggregate change in contract estimates impact on gross margin | 0.20% | 9.50% | 2.20% | 5.50% |  |
Accounts payable and accrued expenses | $ 1,178,983 |  | $ 1,178,983 |  |  | 1,057,460
EPC Electric Transmission Project |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Change in contract estimates, impact on operating results, gain (loss) | 16,600 |  | 26,300 |  |  |
Natural Gas Transmission Project |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Change in contract estimates, impact on operating results, gain (loss) |  | $ 24,600 |  |  |  |
Retained Earnings | Accounting Standards Update 2014-09 |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Cumulative effect adjustment |  |  |  |  | $ (1,800) |
Unearned Revenue |  |  |  |  |  |
Revenue Recognition [Line Items] |  |  |  |  |  |
Accounts payable and accrued expenses | $ 11,400 |  | $ 11,400 |  |  | $ 16,000

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